Question

我的问题是我在listview上有一个产品列表，当我从我的微调器中选择一个值时我保存并发送它以从我的mysql数据库中检索不同的值，问题是我的listview不会在我的微调器上执行onclick事件后更新，我做错了什么？我不知道我是否设法正确解释了我想说的话，谢谢你的帮助

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
            {
                public void onItemSelected (AdapterView < ? > parent, View view,int pos, long id)
                {
                    filtracat();
                }


private void filtracat() {
    cat = spinner.getSelectedItemPosition()+1;
     valor = String.valueOf(cat);
    Toast.makeText(getApplicationContext(),valor,Toast.LENGTH_SHORT).show();
    JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(JSON_CAT, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            hideDialog();
            //parsing json
            for (int i = 0; i < response.length(); i++) {
                try {
                    JSONObject obj = response.getJSONObject(i);
                    Anuncios item = new Anuncios();
                    item.setKey(obj.getString("key"));
                    item.setTitulo(obj.getString("titulo"));
                    item.setImageID(obj.getString("imageID"));
                    item.setModelo(obj.getString("modelo"));
                    item.setPreco(obj.getString("preco"));
                    //gonna set category here
                    //    item.setCategoria(obj.getString("categoria"));
                    //add to array
                    array2.add(item);
                } catch (JSONException ex) {
                    ex.printStackTrace();
                }
            }
            adapter.notifyDataSetChanged();
        }
    }, new ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

        }
    }) {
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();

            params.put("valor", valor);
            return params;
        }


    };
AppController.getmInstance().addToRequesQueue(jsonArrayRequest);
}

我的listview中的原始数据来自

 private void sendRequest() {
    JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(JSON_URL, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray response) {
            hideDialog();
            //parsing json
            for (int i = 0; i < response.length(); i++) {
                try {
                    JSONObject obj = response.getJSONObject(i);
                    Anuncios item = new Anuncios();
                    item.setKey(obj.getString("key"));
                    item.setTitulo(obj.getString("titulo"));
                    item.setImageID(obj.getString("imageID"));
                    item.setModelo(obj.getString("modelo"));
                    item.setPreco(obj.getString("preco"));
                    //gonna set category here
                //    item.setCategoria(obj.getString("categoria"));
                    //add to array
                    array.add(item);
                } catch (JSONException ex) {
                    ex.printStackTrace();
                }
            }
            adapter.notifyDataSetChanged();
        }
    }, new ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

        }
    });
    AppController.getmInstance().addToRequesQueue(jsonArrayRequest);
}

我应该使用相同的数组来更新数据吗？

Answer 1

你可以尝试

创建两个对象

      ArrayList<MobileKeyModel> dropDownModels = new ArrayList<MobileKeyModel>();
      ArrayList<Object> addList = new ArrayList<Object>();

您可以从数据库获取响应

   private void filtracat() {
     StringRequest stringRequest = new StringRequest(Request.Method.POST, JSON_URL,
        new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {

                try {
                    JSONObject jsonObject = new JSONObject(response);
                    JSONArray loginNodes = jsonObject.getJSONArray("parentnodesList");
                    for (int i = 0; i < loginNodes.length(); i++) {
                        JSONObject jo = loginNodes.getJSONObject(i);
                        String key = jo.getString("key");
                        String titulo = jo.getString("titulo");
                        addList.add(key);
                        addList.add(titulo);
                    }

                    pupulateDropDownList();
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        },
        new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

                try {
                    //Respose Error

                } catch (Exception e) {


                }
            }
        }) {
    @Override
    protected Map<String, String> getParams() {
        Map<String, String> params = new HashMap<>();
        return params;
    }

};


  RequestQueue requestQueue = Volley.newRequestQueue(this);
  requestQueue.add(stringRequest);
}

将值填充到listview

void pupulateDropDownList（）{

if (addList != null) {
    for (Iterator<Object> i = addList.iterator(); i.hasNext(); ) {
        MobileKeyModel menuModel = new MobileKeyModel(i.next().toString(), i.next().toString());
        dropDownModels.add(menuModel);

    }

    ArrayAdapter adapter = new ArrayAdapter(this, R.layout.spinner_text, dropDownModels);
    adapter.setDropDownViewResource(R.layout.simple_spinner_dropdown);
    listView.setAdapter(adapter);

   }
}

模特也在这里

公共类MobileKeyModel {

public String key = "";
public String titulo = "";

public MobileKeyModel(String key, String titulo) {
    this.key = key;
    this.titulo = titulo;
}

public String getKey() {
    return key;
}

public void setKey(String key) {
    this.key = key;
}

public String getTitulo() {
    return titulo;
}

public void setTitulo(String titulo) {
    this.titulo = titulo;
}

}

注意您的json必须看起来像

    {"parentnodesList":[{"key":"your key value here","titulo":"Your title"}]}

在微调器事件

1 个答案: